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//! Handle process life-time and message passing for proc-macro client
use crossbeam_channel::{bounded, Receiver, Sender};
use ra_tt::Subtree;
use crate::msg::{ErrorCode, Message, Request, Response, ResponseError};
use crate::rpc::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask, ProcMacroKind};
use io::{BufRead, BufReader};
use std::{
io::{self, Write},
path::{Path, PathBuf},
process::{Child, Command, Stdio},
thread::{spawn, JoinHandle},
};
#[derive(Debug, Default)]
pub(crate) struct ProcMacroProcessSrv {
inner: Option<Handle>,
}
#[derive(Debug)]
pub(crate) struct ProcMacroProcessThread {
handle: Option<JoinHandle<()>>,
sender: Sender<Task>,
}
enum Task {
Request { req: Message, result_tx: Sender<Message> },
Close,
}
#[derive(Debug)]
struct Handle {
sender: Sender<Task>,
}
struct Process {
path: PathBuf,
child: Child,
}
impl Process {
fn run(process_path: &Path) -> Result<Process, io::Error> {
let child = Command::new(process_path.clone())
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()?;
Ok(Process { path: process_path.into(), child })
}
fn restart(&mut self) -> Result<(), io::Error> {
let _ = self.child.kill();
self.child =
Command::new(self.path.clone()).stdin(Stdio::piped()).stdout(Stdio::piped()).spawn()?;
Ok(())
}
fn stdio(&mut self) -> Option<(impl Write, impl BufRead)> {
let stdin = self.child.stdin.take()?;
let stdout = self.child.stdout.take()?;
let read = BufReader::new(stdout);
Some((stdin, read))
}
}
impl std::ops::Drop for ProcMacroProcessThread {
fn drop(&mut self) {
if let Some(handle) = self.handle.take() {
let _ = self.sender.send(Task::Close);
// Join the thread, it should finish shortly. We don't really care
// whether it panicked, so it is safe to ignore the result
let _ = handle.join();
}
}
}
impl ProcMacroProcessSrv {
pub fn run(
process_path: &Path,
) -> Result<(ProcMacroProcessThread, ProcMacroProcessSrv), io::Error> {
let process = Process::run(process_path)?;
let (task_tx, task_rx) = bounded(0);
let handle = spawn(move || {
client_loop(task_rx, process);
});
let srv = ProcMacroProcessSrv { inner: Some(Handle { sender: task_tx.clone() }) };
let thread = ProcMacroProcessThread { handle: Some(handle), sender: task_tx };
Ok((thread, srv))
}
pub fn find_proc_macros(
&self,
dylib_path: &Path,
) -> Result<Vec<(String, ProcMacroKind)>, ra_tt::ExpansionError> {
let task = ListMacrosTask { lib: dylib_path.to_path_buf() };
let result: ListMacrosResult = self.send_task("list_macros", task)?;
Ok(result.macros)
}
pub fn custom_derive(
&self,
dylib_path: &Path,
subtree: &Subtree,
derive_name: &str,
) -> Result<Subtree, ra_tt::ExpansionError> {
let task = ExpansionTask {
macro_body: subtree.clone(),
macro_name: derive_name.to_string(),
attributes: None,
lib: dylib_path.to_path_buf(),
};
let result: ExpansionResult = self.send_task("custom_derive", task)?;
Ok(result.expansion)
}
pub fn send_task<'a, T, R>(&self, method: &str, task: T) -> Result<R, ra_tt::ExpansionError>
where
T: serde::Serialize,
R: serde::de::DeserializeOwned + Default,
{
let handle = match &self.inner {
None => return Err(ra_tt::ExpansionError::Unknown("No handle is found.".to_string())),
Some(it) => it,
};
let msg = serde_json::to_value(task).unwrap();
// FIXME: use a proper request id
let id = 0;
let req = Request { id: id.into(), method: method.into(), params: msg };
let (result_tx, result_rx) = bounded(0);
handle.sender.send(Task::Request { req: req.into(), result_tx }).map_err(|err| {
ra_tt::ExpansionError::Unknown(format!(
"Fail to send task in channel, reason : {:#?} ",
err
))
})?;
let response = result_rx.recv().unwrap();
match response {
Message::Request(_) => {
return Err(ra_tt::ExpansionError::Unknown(
"Return request from ra_proc_srv".into(),
))
}
Message::Response(res) => {
if let Some(err) = res.error {
return Err(ra_tt::ExpansionError::ExpansionError(err.message));
}
match res.result {
None => Ok(R::default()),
Some(res) => {
let result: R = serde_json::from_value(res)
.map_err(|err| ra_tt::ExpansionError::JsonError(err.to_string()))?;
Ok(result)
}
}
}
}
}
}
fn client_loop(task_rx: Receiver<Task>, mut process: Process) {
let (mut stdin, mut stdout) = match process.stdio() {
None => return,
Some(it) => it,
};
loop {
let task = match task_rx.recv() {
Ok(task) => task,
Err(_) => break,
};
let (req, result_tx) = match task {
Task::Request { req, result_tx } => (req, result_tx),
Task::Close => break,
};
let res = match send_message(&mut stdin, &mut stdout, req) {
Ok(res) => res,
Err(_err) => {
let res = Response {
id: 0.into(),
result: None,
error: Some(ResponseError {
code: ErrorCode::ServerErrorEnd as i32,
message: "Server closed".into(),
data: None,
}),
};
if result_tx.send(res.into()).is_err() {
break;
}
// Restart the process
if process.restart().is_err() {
break;
}
let stdio = match process.stdio() {
None => break,
Some(it) => it,
};
stdin = stdio.0;
stdout = stdio.1;
continue;
}
};
if let Some(res) = res {
if result_tx.send(res).is_err() {
break;
}
}
}
let _ = process.child.kill();
}
fn send_message(
mut writer: &mut impl Write,
mut reader: &mut impl BufRead,
msg: Message,
) -> Result<Option<Message>, io::Error> {
msg.write(&mut writer)?;
Ok(Message::read(&mut reader)?)
}
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